unnecessary_brace_in_string_interps

Avoid using braces in interpolation when not needed.

AVOID using braces in interpolation when not needed.

If you're just interpolating a simple identifier, and it's not immediately followed by more alphanumeric text, the {} can and should be omitted.

BAD:

print("Hi, ${name}!");

GOOD:

print("Hi, $name!");

To enable the unnecessary_brace_in_string_interps rule, add unnecessary_brace_in_string_interps under linter > rules in your analysis_options.yaml file:

linter:
  rules:
    - unnecessary_brace_in_string_interps

If you're instead using the YAML map syntax to configure linter rules, add unnecessary_brace_in_string_interps: true under linter > rules:

linter:
  rules:
    unnecessary_brace_in_string_interps: true

Unless stated otherwise, the documentation on this site reflects Dart 3.6.0. Page last updated on 2025-01-27. View source or report an issue.